Try fixing yarn issue in github actions workflow

.github/workflows/lxl-web-tests.yml

@@ -16,8 +16,10 @@ jobs:
     - uses: actions/setup-node@v4
       with:
         node-version: 18
+    - name: Setup yarn
+      run: npm install -g yarn
     - name: Install lxljs dependency
-      run: npm ci
+      run: yarn install --frozen-lockfile
       working-directory: ./lxljs
     - name: Install dependencies
       run: npm ci